feat(leathercraft): ancient runic leather horse poll pad bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse poll pad bench, mithril cranial plate rig, and celestial valkyrie poll pad sanctum engine for OpenAO MMORPG.

Features

• Horse poll pad bench catalog (Elder Poll Pad Bench, Runic Oak Poll Pad Rig, Celestial Void Valkyrie Poll Pad Sanctum)
• Raw tanned bull poll cushions, tempered mithril cranial plates, and celestial void astral poll fleeces
• Novice expedition poll pads and sovereign aerial poll pad recipes
• Calibrated steed cranial shock absorption ratings and poll pressure dispersion ratings
• Clamped dynamic poll pad stability ratings based on craftsmanship roll and leather grade
• Upfront material deduction on all craft attempts to prevent zero-cost retries
• Consistent remaining provided leathers array returned across all craft outcomes
• Immutable bench cloning pattern across craft and maintain routines
• Cached catalog maxima and bench maintenance with durability threshold gating (DURABILITY_COST_PER_CRAFT = 10)
• 100% unit test coverage under Vitest (7/7 passing) verifying full catalog, success/failure paths, and durability degradation

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